package hash.hashmap8;

import org.junit.Test;

import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;

public class DiyTest {

    @Test
    public void haha() {
        ConcurrentHashMap chm = new ConcurrentHashMap();
        chm.put("abc", "abc");
        System.out.println("----");


        HashMap hm = new HashMap();
        hm.put("ab", "abc");
    }


}
